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Finding the Fourth Proportional to 792.64, 1,188.78 and 402.40

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Solution

The fourth proportional to 792.64, 1,188.78 and 402.40 is: 603.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.64 : 1,188.78 = 402.40 : x
  2. Step 2: Convert to fraction form
    792.64/1,188.78 = 402.40/x
  3. Step 3: Cross multiply
    792.64x = 1,188.78 × 402.40
  4. Step 4: Simplify right side
    792.64x = 478,365.07
  5. Step 5: Solve for x
    x = 478,365.07/792.64
  6. Step 6: Final answer
    x = 603.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.